I saw that in many cases the Quicktime player gets better
performances than most of the CoreVideo samples out there. I tried to
understand what was causing this difference by monitoring the
Quicktime player with the ThreadViewer application. I saw that the QT
player (nearly) always decodes movies from a background thread (which
is great).
However when I monitored our application or some CoreVideo samples
(like the LiveMixer) I saw that most of the time the decoding was
done in the main thread which slows down the rendering and the user
interface.
You can see the difference by checking these two screenshots (using
an MPEG 4 movie):
- is there a way to force QT to decode from a background thread all
the time ?
- When and how QT decides to decode from a background thread or from
the main thread ?
Thank you for your help.
Best Regards,
Yves Schmid * GarageCube.
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